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Perception enhancement for low-frequency sound components


Title: Perception enhancement for low-frequency sound components.
Abstract: This invention discloses a method and a plurality of compressive amplitude distortion units for enhancing the perceptibility of the low-frequency portion of a sound by introducing residue harmonics of low-frequency signal components into the sound, where the residue harmonics are generated by a nonlinear function emulating the middle-ear response of a human being. The low-frequency portion in the resultant sound is perceivable to a human listener even if this portion is removed from this sound. In one embodiment, a compressive amplitude distortion unit comprises: a low pass filter for extracting low-frequency components of the input sound signal; a compressive amplitude function processor for generating a harmonics-containing signal from the low-pass signal by a nonlinear function emulating the middle-ear response; a gain block for scaling the harmonics-containing signal such that the signal strength of the scaled harmonics-containing signal is in the same range as that of the initial low-pass signal; an adder for adding the input sound signal and the scaled harmonics-containing signal; and a high pass filter for removing the low-frequency signal components in the output sound signal while still including the residue harmonics. Based on the disclosed method, this invention also discloses two anti-piracy methods that utilize the absence of low-frequency signal components in a sound signal, one for convenient detection of an unauthorized copy of the processed sound signal, another one for discouraging people to make such an unauthorized copy. ... Browse recent Natural Bass Technology Limited patents
USPTO Applicaton #: #20130003989


The Patent Description & Claims data below is from USPTO Patent Application 20130003989, Perception enhancement for low-frequency sound components.




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stats Patent Info
Application #
US 20130003989 A1
Publish Date
01/03/2013
Document #
13171476
File Date
06/29/2011
USPTO Class
381102
Other USPTO Classes
700 94
International Class
/
Drawings
10


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Piracy
Scaling
Enhancement
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Electrical Audio Signal Processing Systems And Devices   Including Frequency Control   Automatic Tone Control   With Amplitude Control  

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